Liebherr will Unveil Powerful Four-Axle Mobile Crane at ConExpo
Feb. 24, 2020 — Liebherr will unveil its new LTM 1120-4.1 at ConExpo in Las Vegas using the slogan “There’s nothing more on 4!”
Liebherr says the LTM 1120-4.1 is the most powerful four-axle all-terrain crane ever built.
The new 135-U.S.-ton crane breaks into a performance class that previously was the sole preserve of five-axle cranes.
Its 217’ telescopic boom is on par with 240-U.S.-ton class cranes, and is the longest ever installed on a four-axle mobile crane. Liebherr will start deliveries of the new LTM 1120-4.1 in autumn 2020.
Lifting Capacity and Boom Length
Delivering maximum performance on a four-axle mobile crane has been traditional at Liebherr for decades. When the current LTM 1100-4.2 was launched in 2009, it set new standards in the four-axle class with a lifting capacity of 22,490 lbs. on its 197’ telescopic boom.
The new 135-U.S.-ton crane has added 18% to that capacity at the same boom length. What’s more, the new LTM 1120-4.1 can extend its telescopic boom to 217’, an additional 10%. That lets it reach the same height as many 240-U.S.-ton mobile cranes.
The new LTM 1120-4.1 delivers outstanding lifting capacity, particularly with the boom fully raised.
Its 19,800-lb. capacity on 217’ of boom makes it ideal for erecting tower cranes and radio masts.
Lattice extensions enable hook heights to 308’ and radii to 210’. For that, a 23’ lattice boom extension and 35’-62’ double folding jib are added.
The jib offset angle can also be adjusted by a hydraulic cylinder to any angle from 0° to 40°. A 6.6’ erection jib and a runner, which can be swung to the side, round off the equipment list.
Economy and Flexibility
The new LTM 1120-4.1 can tackle jobs that normally would require a five-axle crane. That eliminates the logistics work needed for the larger model. Because a four-axle crane delivers benefits in terms of licensing and route permits, it can tackle jobs faster and with greater flexibility. The design of a four-axle crane also enables it to work where there isn’t enough space for a larger crane.
On constricted sites, in particular, Liebherr’s VarioBallast and VarioBase innovations deliver enhanced performance, flexibility, and safety for this new crane.
VarioBallast enables the LTM 1120-4.1 to operate with a ballast radius of 12.6’ or 15.6’. The ballast radius can be reduced by 3’ quickly and easily using standard, mechanically adjustable ballasting cylinders when site conditions get tight. The large ballast radius delivers higher performance and often also cost benefits by reducing ballast transport as many crane jobs can be completed using fewer counterweights.
The maximum of 68,300 lbs. of ballast is distributed so variably that in addition to the 26,400-lb.-axle-load version, uniform axle loads of 29,800, 33,000, or 36,400 lbs. can also be achieved. That means benefits driving on construction site and in countries where higher axle loads are permitted.
ECOdrive and ECOmode Reduce Fuel Consumption and Noise
A six-cylinder Liebherr diesel engine in the undercarriage develops 449 hp and 1,722 ft.-lbs. of torque. The engine satisfies the new stage V emissions directive and can also be built to comply with the regulations which apply in countries outside of Europe, for example Tier 4 for the USA or stage III for lesser-regulated countries.
The ZF-TraXon gearbox transmits power to the crane's axles. ECOdrive has proven its value over several years by saving fuel and reducing noise. Also, Hillstart Aid makes starting on gradients easier.
ECOmode for crane the operations is now standard on Liebherr mobile cranes with a load-sensing control system – the crane controller calculates the perfect engine speed for the working speed selected using the control lever to avoid unnecessarily high engine speeds. That also saves fuel and makes the engine quieter.